Pls help!! I’m 16, currently sleeping with my auntie’s hubby & falling in Love with him!

I am 16 years old and currently sleeping with my auntie’s husband. They have three child n but are alway arguing. We’v n kissing and ro cing before we started sleeping together. When my aunt and her husband are together, we act as if nothing is going on, so no one suspects anything yet. Unfortunately, I’m now falling in love with him. I know he will never leave my aunt because he is like the bread-winner of the family and owns the house we live in. I love my aunt and I’m grateful to her for letting me live with them. Should I end this affair? If I do, should I tell my aunt the type of man he’s married to?